The Manly app appeared in the App Store last year but has only come to prominence after an advertising campaign on social media.

For £4.49 a month a subscriber can select from an array of images of six-packs and chest muscles to enhance his physique. The software can boost arm muscles, remove facial blemishes, change skin tone and add a beard and tattoos.

Campaigners warned that the app reinforced unrealistic and harmful ideas of male beauty